People protest against the government's failure to rescue 276 abducted schoolgirls on May 7 in Port Harcourt, Nigeria.Militants from the Boko Haram group kidnapped the teenage schoolgirls on April 14 in Chibok province. epa

Members of the All Nigeria Confederation of Principals of Secondary Schools stage a protest against the government in Ibadan. The Nigerian government has offered a reward for any information leading to the location of the abductors and has accepted U.S. help to finding the missing girls. epa

Mia Kuumba brandishes a wooden stick during a protest May 6 at the Nigerian Embassy in Washington against the kidnapping of 276 girls. Manuel Balce Ceneta, AP

Protesters crowd the gate of the Nigerian Embassy in northwest Washington. Abubakar Shekau, leader of the Islamist extremist group Boko Haram, has vowed to sell the kidnapped schoolgirls as brides or slaves. Manuel Balce Ceneta, AP

A woman cries as she attends a demonstration calling for the rescue of the kidnapped girls in Abuja. Sunday Alamba, AP

People wave signs and shout slogans as they demonstrate outside the defense headquarters in Abuja, Nigeria. Sunday Alamba, AP

A woman wipes away tears during the protest. Sunday Alamba, AP

People demand the rescue of the kidnapped schoolgirls. Sunday Alamba, AP

Brig. Gen. Chris Olukolade, left, Nigeria's top military spokesman, speaks to people at the demonstration. Sunday Alamba, AP

Women attend a demonstration in Lagos, Nigeria, calling on the government to rescue kidnapped schoolgirls on May 5. The 276 schoolgirls were kidnapped by Boko Haram militants on April 14 in Chibok town. Sunday Alamba, AP

Abubakar Shekau, center, leader of the Islamist extremist group Boko Haram, vows to sell hundreds of schoolgirls kidnapped in northern Nigeria three weeks ago. "I abducted your girls. I will sell them in the market, by Allah," he said. Reports claim the girls may have been sold as brides in Chad and Cameroon for as little as $12. Boko Haram via AFP/Getty Images

A woman at the state government house in Lagos holds a sign as members of civil society groups demand the release of kidnapped girls. Pius Utomi Ekpei, AFP/Getty Images